Which of the following is NOT caused by the gravitational force acting between the Moon and Earth?
a. Ocean tides on Earth b. Earth's rotation period (one day) is gradually becoming longer c. The same side of the moon always face Earth. d. The moon and earth are gradually becoming cooler.
Which of the following objects exerts gravitational force? Please help! I really need to get this right.PLEASE?
Which of the following objects exerts gravitational force? I. the Sun II. the Earth III. the Moon IV. a basketball V. an apple A. I and II only B. I, II, and III only C. IV and V only D. I, II, III, IV and V
Explain why no work is done by the gravitational force that acts on the moon to keep it in orbit around earth.?
A, no work is done because the moon (if we're assuming the orbit is circular) stays the same distance from the earth. The motion is perpendicular to the acceleration thus work equals 0. B, Why not the moon? Or maybe a person standing on the Earth's surface. In both there is an acceleration (gravity) but neither is 'speeding' up. ii, If we can use the Earth as the frame of reference then anything on the surface of the earth is standing still (compared to the earth surface) but accelerating at it's maximum. (the further up you go, the less acceleration gravity is)
Which of the following correctly describe the gravitational attraction between Earth and the Moon?
The first two statements are false and the second two statements are true (assuming you meant Earth and not Earch). @John W - There you go again stating false things. You really really need to check your facts before you state them, otherwise people are going to get misinformation. "It's the same force on both masses but as the Earth is much more massive than the Moon, the effects of that force are less noticeable on the Earth." This is false. The Earth does not feel a lesser force from the Moon than the Moon feels from the Earth. Both objects feel a gravitational force of the same magnitude. You could see this if you just plugged in the numbers: Force of gravity on the Moon from Earth - F = G * (Mass of Moon) * (Mass of Earth) / R^2 F = (6.67E-11 Nm^2/kg^2) * (7.3E22 kg) * (6.0E24 kg) / (3.6E8 m)^2 F = 2.3E20 N Force of gravity on the Earth from the Mooth - F = G * (Mass of Earth) * (Mass of Moon) / R^2 F = (6.67E-11 Nm^2/kg^2) * (6.0E24 kg) * (7.3E22 kg) / (3.6E8 m)^2 F = 2.3E20 N Hopefully you can see that the forces felt by each body are the same.
Is the gravitational force between the earth and the sun larger than of the earth and the moon? If so,why doesn't it affect the tides as the moon does?
Yes, the sun in fact pulls on the earth nearly 200 times as strongly as the moon does. But tidal forces aren't simply a matter of how strongly a celestial body is pulling on the earth, but of how strongly it "stretches" the earth. In order to exert a "stretching" force on the earth's oceans, a celestial body has to exert a considerably stronger pull on the earth's near side than it does on the far side. It's the difference between the "front" and "rear" forces that causes the stretch and drives the tides; and it turns out that this differential is a function of how far away the celestial body is located. Specifically, when a body is relatively close (like the moon), there's a relatively large difference between the pulls it exerts on earth's near and far sides, compared to the effect of a more distant body like the sun.Let's put this into numbers. We can measure the "g-forces" that the sun and moon each exert on the near and far sides of the earth on an average day (we use an "average" day because the actual amount changes as the earth's distance from the moon and the sun changes over the course of a month and a year). Since the pull is very tiny compared to the earth's own pull, we'll use units of a "pico-g", or one-trillionth of a g-force.Here's the effect the sun has:Pull on earth's near side: 1815.479 pico-g'sPull on earth's far side: 1815.170 pico-g'sDifference (tidal stretching force): 0.309 pico-g'sHere's the effect the moon has:Pull on earth's near side: 10.946 pico-g'sPull on earth's far side: 10.230 pico-g'sDifference (tidal stretching force) 0.716 pico-g'sSo, we can see that the moon's tidal effect is about twice as great as the sun's, even though the sun's actual gravitational force is much greater.It's worth noting that, even though the sun's tidal effect is weaker, it is noticeable, and during times when the sun and moon are aligned (i.e. during new moons and full moons) and so "stretching" along the same line, tides are noticeably higher than at other times of the month.
How does the Moon cause tides on earth when its gravity is one sixth to that of earth?
In most places, but not everywhere, there are two high tides and two low tides a day. The difference in height between high and low tides varies, as the moon waxes and wanes from new to full and back to new again.The moon is primarily responsible for the rising and falling of ocean tides, but, for any particular spot on Earth’s surface, the height of the tides and their fluctuation in time depends not only on the moon, but also on the sun – and also on the shape of the specific beach, the larger coastline, the angle of the seabed leading up to land, and the prevailing ocean currents and winds.SPRING TIDESAround each new moon and full moon, the sun, Earth, and moon arrange themselves more or less along a line in space. Then the pull on the tides increases, because the gravity of the sun reinforces the moon’s gravity. In fact, the height of the average solar tide is about 50% the average lunar tide.Thus, at new moon or full moon, the tide’s range is at its maximum. This is the spring tide: the highest and lowest tide. Spring tides are not named for the season. This is spring in the sense of jump, burst forth, rise. So spring tides bring the most extreme high and low tides every month, and they happen around full and new moon.SUPERMOONWhen the new moon or full moon closely aligns with closest point to Earth in the moon’s orbit – then we have a supermoon and extra-large spring tides.The moon is at its closest to Earth, and thus the Earth’s oceans are feeling the pull of the moon’s gravity most powerfully.NEAP TIDESThere’s about a seven-day interval between spring tides and neap tides, when the tide’s range is at its minimum. Neap tides occur halfway between each new and full moon at the first quarter and last quarter moon phase when the sun and moon are at right angles as seen from Earth. Then the sun’s gravity is working against the gravity of the moon, as the moon pulls on the sea. Neap tides happen approximately twice a month, once around first quarter moon and once around last quarter moon.Earth has two tidal bulges, one of the side of Earth nearest the moon (where the moon’s gravity pulls hardest), and the other on the side of Earth farthest from the moon (where the moon’s gravity pulls least).
If gravitational force acts between all objects, why don't we move towards each other?
This is a really good question.First of all, it’s important to recognize that the gravitational force exerted by any of the various bodies around you (your computer monitor, cell phone, best friend, football, house, toilet, etc) is incredibly small in magnitude compared to that of the Earth. Secondly, the reason you aren’t accelerating towards your computer monitor in front of you is because if you account for all the objects around you and their respective gravitational pull, it all cancels out and you are in static equilibrium. Even if it doesn’t cancel perfectly, the force will be so small that friction will inhibit any noticeable movement. If you go on a journey around the Solar System, then you need to account for the gravitational pull of the various planets and the Sun because the magnitudes are no longer negligible and do not necessarily cancel out.